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has a description of Clitocybe fasciculata that could work for this one,http://www.svims.ca/council/Lepist.htm#n3a
Take a look and see if anything there speaks against it. If not, this could be the species they mean, not necessarily the right name, though..
It’s supposed to be a synonym to Lepista caespitosa – maybe the same as, or included in, the old Lepista panaeola which was known from Canada and Europe in the 19th century.

as I mentioned to Irene, Lepista was my first hit in the field, then convinced myself otherwise when I looked at the brownish gills and apparent brown spore drop on stipe. but it’s important to check your work and test your theory! MO is very useful for helping to steer yourself back on the right path…

a real sporedrop on a slide was pale, spores verruculose and thick-walled, 5.5-6 × 3-4 microns.